Make sure a device is not used as router

Not possible, see → Stop Zigbee Mains powered device from being a router? (ZHA)

Summary: You are using a Zigbee Router product in a way that it is not supposed to work; the possible resolution is to either replace it with another lightbulb product that is purposely designed to be a Zigbee End Device instead of a Zigbee Router device, or change the way you use your Zigbee Router lightbulbs by disconnecting any dumb switches and make sure they always have power.

I highly recommend that you also read and try to follow the advice/tips in these community guides:

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